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2017年 24卷 4期
刊出日期：2017-04-15
357
Jun-wei Qiao,Gang Wang,Yong Zhang,Peter K. Liaw,Wei-hua Wang5
Non-linear behavior in advanced materials
The 17th IUMRS International Conference in Asia was held in Qingdao from October 20th to 24th, 2016. This conference contained 28 international symposia. One of symposia, titled as Serration and Noise Behavior in Advanced Materials, was well organized, which provided an effective platform to discuss the non-linear behavior in advanced materials including high-entropy alloys, bulk metallic glasses, and lightweight alloys, etc. Generally speaking, serration and noise phenomenon exist everywhere, such as, the crackling noise arising from paper crumpling, and brain wave measured by instruments, etc. In the materials science, the well-known examples are the small serrated plastic deformation after yielding in plain steels, and the serrated plastic flow in Al-Mg alloys, which are believed to be associated with interaction between the mobile solute atoms and forest dislocations. Besides those, the non-linear behavior is also observed in some advanced materials. For example, even without the dislocations, the serrated plastic deformation also can be found in bulk metallic glasses, which is dominated by shear banding. In order to deeply understand the nature of serration and noise in advanced materials, the non-linear mechanical behavior in many kinds of materials is inspected. In current special issue, twenty papers focused on the non-linear mechanical behavior are published. The topics include but are not limited to theoretical modeling, experimental characterization, and numerical simulations.
2017 Vol. 24 (4): 357-357 [
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358
Wan-li Zhao,Ding-hao Miao,Yong Zhang*,Zhan-bing He
Big-data analysis of phase-formation rules in high-entropy alloys
Big-data analysis of phase-formation rules of high-entropy alloys (HEAs) was conducted and a phase formation rule from a dynamic view was deduced. It was indicated in literatures that cooling rate has a strong influence on the phase formation of HEAs. Higher cooling rate may promote the generation of amorphous phase, and accordingly suppress the formation of intermetallics. Meanwhile, it was also shown that cooling rate had little impact on the formation of solid-solution phase. To demonstrate this rule, a series of FeCoNi(AlSiB)x HEAs ribbons were fabricated by a melt-spinning technique, and the microstructure, mechanical, and magnetic properties were also investigated. The results show that all ribbons exhibit disordered solid-solution structure. The addition of boron changes the alloy from ductility to brittleness, but without evident change of magnetic properties. The alloy in the nominal composition of FeCoNi(AlSi)0.2 has the best combination of mechanical and magnetic properties. A distinct feature of HEAs in magnetization was noticed and explained.
2017 Vol. 24 (4): 358-365 [
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366
Jiao-jiao Li,Jun-wei Qiao,,*,Karin A. Dahmen,Wei-ming Yang,Bao-long Shen5,Ming-wei Chen6
Universality of slip avalanches in a ductile Fe-based bulk metallic glass
Intermittent serrated flows of a novel ductile Fe60Ni20P13C7 bulk metallic glass (BMG) at variant strain rates were investigated by statistics analysis. Peak and clutter distribution of slip-avalanche magnitudes are displayed during stable plastic flows at strain rates of 2×10-4 s-1 and 5×10-5 s-1, respectively, which means that serration behavior depends on the strain rate. However, the remarkable agreement between measured slip-avalanche magnitudes and the scaling behavior, i.e. a universal complementary cumulative distribution function (CCDF) predicted by mean-field theory (MFT) model, indicates that the plasticity of the present Fe-based BMGs can be tuned by imposed strain rates: Smax~-λ. This tuned plasticity is elucidated with expended free-volume model. Moreover, the scaling behavior of serrated flows for other strain rates can be predicted as well.
2017 Vol. 24 (4): 366-371 [
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372
Jing Hu,Yun-xuan Weng,Xiao-li Li,Bao-an Sun,*
Extracting compressive stress-strain curve based on stick-slip shear banding process in bulk metallic glasses
Based on the stick-slip process, an effective method to extract the stress-strain curve directly from the crosshead displacement-load raw data in compression of bulk metallic glasses was proposed. The method was tested in two bulk metallic glass samples with different plasticities and shear band morphologies. The extracted stress-strain curves were found to well resemble the stress-strain curve measured by a laser extensometer. In addition, the extracted curve could resolve fine structures of serrated flow much better than that measured by extensometer, thus facilitating the study of shear banding process. Results obtained by this method made the stick-slip dynamics of shear banding valid, and this method could be employed to obtain the real strain of small-sized metallic glass samples where extensometer cannot be applied.
2017 Vol. 24 (4): 372-377 [
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378
Can Yang,Le-ming Lu,Zhi-wu Zhao,Jia-hao Li,Feng Gong,Jiang Ma
Micro thermoplastic forming of a Pd-based metallic glass: theory and applications
Metallic glasses (MGs) are considered as the ideal materials for miniature fabrication because of their excellent micro thermoplastic forming ability in the supercooled liquid region. The understanding and controlling of micro filling process are fundamental for miniature fabrication and their applications, yet presently remain unresolved issues. A universal kinetic equation was proposed to describe the filling kinetics of viscous metallic glass supercooled liquid in micro molds with general cross sectional shapes by using a Pd-based MG as the modeling material and a series of potential applications based on the micro thermoplastic forming of the MG were developed.
2017 Vol. 24 (4): 378-384 [
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385
Jun Tan,*,Jun-yan Gao,Xue-mei Qin,Zheng-rong Fu,Dong Li,Min Li,Xiu-chang Wang, Gang Wang
Fractography and morphology of shear bands of a Zr-based bulk metallic glass
Bulk metallic glasses (BMGs) have attracted considerable attention in the last few decades particularly triggered by their potential applications as novel structural and/or functional materials, owing to their superior strength, large elastic strain limit and relatively low Young′s modulus etc. compared to their crystalline counterparts. Here, a 3D reconstruction application to the fractography and the morphology of shear bands was reported for a ductile Zr56Co28Al16 (at.%) BMG through a Phenom series desktop scanning electron microscope. The results of the 3D reconstruction and the following contour analysis indicate a typical shear fracture mode for the investigated alloy. It is inferred that the fractography and the morphology of shear bands might be dependent on their composition, structure states, and loading conditions for BMGs.
2017 Vol. 24 (4): 385-389 [
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390
Li-ping Yu,Shu-ying Chen,Jing-li Ren,,*,Yang Ren,Fu-qian Yang5,Karin A. Dahmen6, Peter K. Liaw,
Plasticity performance of Al0.5CoCrCuFeNi high-entropy alloys under nanoindentation
The statistical and dynamic behaviors of the displacement-load curves of a high-entropy alloy, Al0.5CoCrCuFeNi, were analyzed for the nanoindentation performed at two temperatures. Critical behavior of serrations at room temperature and chaotic flows at 200°C were detected. These results are attributed to the interaction among a large number of slip bands. For the nanoindentation at room temperature, recurrent partial events between slip bands introduce a hierarchy of length scales, leading to a critical state. For the nanoindentation at 200°C, there is no spatial interference between two slip bands, which is corresponding to the evolution of separated trajectory of chaotic behavior.
2017 Vol. 24 (4): 390-396 [
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397
Ji-chao Qiao,,*,Jean-marc Pelletier,Ning Li,Daniel Crespo,Yao Yao,**
Slow β relaxation in La-based metallic glasses based on mechanical spectroscopy measurements
Dynamic mechanical relaxations of La-based metallic glasses were investigated by mechanical spectroscopy. In the framework of the mixing enthalpy of constituent atoms, it was found that β relaxation was less evident by the addition of Cu to replace Ni in the LaCuNiAl glassy alloy. By introducing Cu into the LaNiAl metallic glass, the mixing enthalpy was less negative, which led to weaker β relaxation of the metallic glasses. The α relaxation of the La-based metallic glasses could be described by a Kohlrausch-Williams-Watts (KWW) function with a Kohlrausch exponent βKWW around 0.5. It should be noted that physical aging above the glass transition temperature Tg induced a decrease of β relaxation intensity in the La-based metallic glass.
2017 Vol. 24 (4): 397-401 [
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402
Xu-dong Yuan,Sheng-hai Wang,Kai-kai Song,*,Xiao-liang Han,Yu-sheng Qin,Dong-fang Li, Xue-lian Li,Bo Song,Hui Xing,Li Wang
Effect of pre-existing shear bands on mechanical properties and serration behaviors in bulk metallic glasses
Pre-existing (multiple) shear bands were introduced into the ductile Zr56Co28Al16 and Zr65Ni10Cu15Al10 bulk metallic glasses (BMGs) through the lateral-deformation, respectively. It was found that the pre-exiting shear bands can further enhance the compressive plasticity of ductile BMGs. According to the serration analysis on the plastic deformation of the as-cast and the pre-deformed samples, the serration events in the stress-strain curves during deformation display a self-organized critical (SOC) behavior. Compared with the as-cast BMGs, a larger power-law scaling exponent calculated based on serrated flow behaviors becomes larger for the pre-deformed BMGs, implying that the shear banding stability of BMGs is effectively enhanced. This should be caused by the pronounced interactions of shear bands during plastic deformation for the pre-deformed BMGs. However, by introducing a large amount of multiple shear bands into the glassy matrix, it also becomes easier for shear bands to propagate along the pre-existing shear bands, leading to a lower cut-off elastic energy density for the pre-deformed BMGs. More multiple shear bands with stronger interactions for the pre-deformed BMGs could provide a larger chance to activate the shear-band cracking but less local elastic energies are remained for the subsequent crack-linking.
2017 Vol. 24 (4): 402-410 [
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411
Tao Wang, Xiao-hua Chen,*,Guo-dong Shi,Chang-rong Li,Zi-dong Wang,**
Formation and capturing of nanoparticles in Cu-1wt.%Fe alloy melt during directional solidification process
A single crystal Cu-1wt.%Fe alloy with finely dispersed iron-rich nanoparticles which keep coherent interface with the copper matrix was prepared under directional solidification. Formation of nanoparticles in the alloy melt was investigated by performing differential scanning calorimeter tests and designed water quenching experiment at a certain temperature. Results show that iron-rich nanoparticles are formed in the Cu-1wt.%Fe alloy melt before primary α-Cu forms, which is not consistent with equilibrium phase diagram. Mechanism that iron-rich nanoparticles are uniformly captured in the matrix was described, which is that numerous nanoparticles follow Brownian motions and are engulfed in the solidified matrix which makes it possible to form uniformly distributed nanoparticles reinforced single crystal Cu-1wt.%Fe alloy.
2017 Vol. 24 (4): 411-415 [
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416
Yong-jiang Huang,,,*,Peng Xue,Xiang Cheng,Ya-ming Wang,Fu-yang Cao,**, Zhi-liang Ning, Jian-fei Sun,
Plasticity improvement of a Zr-based bulk metallic glass by micro-arc oxidation
Mciro-arc oxidation (MAO) was used to coat porous films on the surface of a Zr-based bulk metallic glass sample. The compressive test results indicated that, compared with the as-cast sample, the MAO treated one exhibited higher deformation capacity, associated with multiple shear bands with higher density on the side surface and well-developed vein patterns with smaller size on the fractured surface. The pore in the MAOed film and the matrix/coating interface initiated the shear bands and impeded the rapid propagation of shear bands, thus favoring the enhanced plasticity of the MAO treated sample. The obtained results demonstrated that MAO can be considered as an effective method to finely tune the mechanical performance of monolithic bulk metallic glasses.
2017 Vol. 24 (4): 416-420 [
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421
Zhi-qiang Wei,Xiang-ru Chen*,Hong-gang Zhong,Qi-jie Zhai,Gang Wang
Hot tearing susceptibility of Fe-20.96Cr-2.13Ni-0.15N-4.76Mn-0.01Mo duplex stainless steel
The hot tearing susceptibility of a Fe-20.96Cr-2.13Ni-0.15N-4.76Mn-0.01Mo duplex stainless steel was investigated using method of constrained solidification shrinkage in one dimension. An apparatus for real-time measuring the contraction stress and temperature during solidification was developed, which can achieve the in-situ observation of melting and solidification and avoid the large temperature gradient of casting under the condition of pouring. The results show that the contraction stress increases significantly when the core temperature of casting reaches the liquidus temperature. The contraction stress is released when the core temperature of casting reaches 1456°C. At this temperature, the hot tearing susceptibility of duplex stainless steel is the largest. With decreasing the core temperature to 1363°C, the slope of contraction stress increases, which is related to the ferrite-to-austenite transformation.
2017 Vol. 24 (4): 421-425 [
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426
Zi-long Zhao,,Xue-gang Xing,Yi Luo,Yi-de Wang,,Wei Liang,*
Influence of Al-Si additions on mechanical properties and corrosion resistance of Mg-8Li dual-phase alloys
Sheet samples of Mg-8Li, Mg-8Li-3Al, Mg-8Li-3AlSi and Mg-8Li-5AlSi alloys were obtained by hot rolling. Optical microscope, microhardness tester, nanoindentor, X-ray diffractometer and electrochemical analyzer were adopted to investigate the microstructures, micro-mechanical properties and corrosion resistance. Roller was preheated to 150°C before rolling process, and rolling reduction designed was about 20% per pass with a total rolling reduction of 84%. The rolled plates were annealed at 200°C for 120 min. The tensile tests were performed at room temperature. Experimental results showed that both the strength and corrosion resistance of the α+β dual-phase of Mg-Li alloy were significantly improved with adding Al-Si elements. The strength enhancement was attributed to the solid solution of Al into the α-Mg matrix and into the β-Li matrix as well as to the precipitation strengthening of Mg2Si particles. Besides, the dendrite grains of α-Mg transformed to equiaxed ones with addition of Al into alloy Mg-Li.
2017 Vol. 24 (4): 426-429 [
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430
Wei-zhong Liang,*,Zhi-liang Ning,,Gang Wang,Zhi-jie Kang,Hai-chao Sun,,Yong-sheng Chen
Elastic deformation behavior of CuZrAlNb metallic glass matrix composites with different crystallization degrees
The room temperature brittleness has been a long standing problem in bulk metallic glasses realm. This has seriously limited the application potential of metallic glasses and their composites. The elastic deformation behaviors of metallic glass matrix composites are closely related to their plastic deformation states. The elastic deformation behaviors of Cu48-xZr48Al4Nbx (x=0, 3 at.%) metallic glass matrix composites (MGMCs) with different crystallization degrees were investigated using an in-situ digital image correlation (DIC) technique during tensile process. With decreasing crystallization degree, MGMC exhibits obvious elastic deformation ability and an increased tensile fracture strength. The notable tensile elasticity is attributed to the larger shear strain heterogeneity emerging on the surface of the sample. This finding has implications for the development of MGMCs with excellent tensile properties.
2017 Vol. 24 (4): 430-434 [
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435
Ying Bao,,Dong-ye Yang,Na Liu,Guo-qing Zhang,Zhou Li,Fu-yang Cao,*,Jian-fei Sun,**
High temperature deformation behavior and processing map of hot isostatically pressed Ti-47.5Al-2Cr-2Nb-0.2W-0.2B alloy using gas atomization powders
The hot compressive deformation behavior of hot isostatically pressed Ti-47.5Al-2Cr-2Nb-0.2W-0.2B alloy using gas atomization powders was systematically investigated and the processing map was obtained in the temperature range of 1323-1473 K and strain rate range of 0.001-0.5 s-1. The calculated activation energy in the above variational ranges of temperature and strain rate possesses a low activation energy value of approximately 365.6 kJ/mol based on the constitutive relationship models developed with the Arrhenius-type constitutive model respectively considering the strain rate and deformation temperature. The hot working flow behavior during the deformation process was analyzed combined with the microstructural evolution. Meanwhile, the processing maps during the deformation process were established based on the dynamic material model and Prasad instability criterion under different deformation conditions. Finally, the optimal hot processing window of this alloy corresponding to the wide temperature range of 1353-1453 K and the low strain rate of 0.001-0.1 s-1 was obtained.
2017 Vol. 24 (4): 435-441 [
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442
Sheng-feng Guo,*,Chen Su,Jia-xiang Cui,Jing Li,Guan-nan Li,Meng Zhang,Ning Li
Effects of B addition on glass forming ability and thermal behavior of FePC-based bulk metallic glasses
The FePC-based bulk metallic glasses (BMGs) have been demonstrated to possess high plasticity and good soft magnetic properties. However, the relatively poor glass forming ability (GFA) and thermal stabilities limited their application in industries. The effects of microalloying with B in FePC-based BMGs on the GFA and thermal behaviors were systematically investigated. It was found that a small amount of B addition can dramatically enhance the GFA of FePC-based BMGs, which in turn leads to the critical maximum diameter up to 2 mm for full glass formation even using low cost raw materials. The underlying mechanism of the enhancement of GFA from the competing crystalline phase with amorphous phase, the average thermal expansion coefficient and dynamic viscosity were discussed in detail.
2017 Vol. 24 (4): 442-447 [
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448
Wen-juan Ge,Xu-ting Li,Peng Li,Peng-chao Qiao,Jian-wei Du,Shuai Xu,Yan Wang*
Microstructures and properties of CuZrAl and CuZrAlTi medium entropy alloys prepared by mechanical alloying and spark plasma sintering
Equiatomic CuZrAl and CuZrAlTi medium entropy alloys were designed and synthesized by mechanical alloying and spark plasma sintering technique. The alloying behavior, phase evolutions, microstructures and properties of samples were investigated by X-ray diffraction, differential scanning calorimetry, field emission scanning electron microscopy, microscopy/Vickers hardness testing and electrochemical polarization measurement. The results indicate that the final products of as-milled alloys consist of amorphous phases. Ti addition improves the glass forming ability of as-milled alloys. The as-sintered CuZrAl alloy contains face-centered cubic (fcc) solid solution, Al1.05Cu0.95Zr and AlZr2 phases at different sintering temperatures. With Ti addition, the as-sintered sample is only composed of intermetallics at 690°C, while fcc1, fcc2 and CuTi3 phases are formed at 1100°C. CuZrAlTi-1100°C alloy exhibits the highest hardness value of 1173 HV0.2 owing to the high sintering density, solid solution strengthening and homogeneous precipitation of nano-size crystalline phase. CuZrAlTi-690°C alloy presents a similar corrosion resistance with 304L stainless steel in seawater solution and further possesses the lower corrosion rate.
2017 Vol. 24 (4): 448-454 [
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455
Bo Yuan,Jiao-jiao Li,Jun-wei Qiao,,*
Statistical analysis on strain-rate effects during serrations in a Zr-based bulk metallic glass
By means of statistical analysis, the deformation mechanisms taking place in elastic loading and plastic shearing stages during serrated flows on the stress-strain curves for bulk metallic glasses were studied comprehensively. Normalized serration number presented a linear increasing tendency with the decrease of applied strain rates due to the reduction of free volumes. An excellent plastic deformation was illustrated from the influences of structure arrangement with activation energy. By using mean-field theory (MFT), maximum elastic-energy density at different strain rates could be predicted by MFT besides maximum stress drops during serrations. These results were helpful for understanding the serrated flow behavior or designing decent schemes to improve the plasticity of bulk metallic glasses at room temperature.
2017 Vol. 24 (4): 455-461 [
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462
Tao Zhang,,Cheng-yong Wang,*,Lugee Li,**,Yong Zhang,Cui-lan Liu
Mass production of magnetocaloric LaFeMnSiB alloys with hydrogenation
LaFe11.39Mn0.35Si1.26B0.1Hx alloys were prepared by hydrogenation. Samples were annealed at 1343 K for 30-90 h to form the NaZn13 phase. La-rich and α-Fe secondary phases were also detected. Saturated hydrogenation at 553 K and 0.15 MPa of H2 pressure for 5 h was employed to improve the Curie temperature of the alloys to 279 K. The maximum magnetic entropy change, relative cooling power, and adiabatic temperature change of LaFe11.39Mn0.35Si1.26B0.1Hx annealed at 1343 K for 90 h after hydrogen absorption are 6.38 J/(kg·K) (magnetic changes μ0ΔH=1.65 T), 100.1 J/kg (μ0ΔH=1.65 T), and 2.2 K (μ0ΔH=1.48 T), respectively. Although the maximum magnetic entropy change of the LaFe11.39Mn0.35-Si1.26B0.1Hx alloys is lower than those of similar alloys with high purity raw materials, the relative cooling power is nearly the same. The effect of impurities of the raw materials used was also discussed. It is assumed that the impurity of 0.2 wt.% Al is responsible for the reduced entropy change of the resulted alloys. The LaFe11.39Mn0.35Si1.26B0.1Hx alloys prepared by this method could be a low cost alternative material for room temperature magnetic cooling applications.
2017 Vol. 24 (4): 462-468 [
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Jun-feng Zhao,Shan-guang Liu,Xiao-guang Yuan,*,Jian-fei Sun,**,Hong-jun Huang, Fu-yang Cao,Hong-xian Shen,Yu-long Wang
Effect of Al22Si/ZL102 bimetal interface fabricated by extrusion at near-eutectic temperature
The Al22Si/ZL102 bimetal was designed and prepared by extrusion at near-eutectic temperature. The properties and fracture behaviors of different surface treatments between oxide film and zinc coating were compared between the Al22Si and ZL102 bimetal. The average bonding strength of bimetal with intermittent oxide film interface was about 89.3 MPa, which is higher than that of the bimetal fabricated by zinc coating method (about 76.3 MPa). During the process of extrusion, the oxidation film was extruded to crush and the metal was extruded through the micro-cracks of the oxidation film, then the two surfaces were joined together. Altogether, the results showed that extrusion at near-eutectic temperature is favorable for achieving a high-quality metallurgical bonded interface.
2017 Vol. 24 (4): 469-474 [
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Juan-juan Liu,Qing Wang,,*,Kang Sun,Sebastien Gravier,Jean-jacque Blandin,Bao-an Sun, Jian Lu
Serrated plastic flow behavior and microstructure in a Zr-based bulk metallic glass processed by surface mechanical attrition treatment
The serrated plastic flow, microstructure and residual stress of a Zr55Cu30Ni5Al10 bulk metallic glass (BMG) undergone surface mechanical attrition treatment (SMAT) have been investigated by a combination of compression tests with scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and the incremental hole-drilling strain-gage method. It is found that SMAT leads to various microstructural modifications and residual stress distribution in the surface layers of the Zr-based BMG due to the mechanically-induced nanocrystallization and generation of shear bands. As a result, the BMG alloy exhibits a remarkable work-hardening like behavior and significant increase of plastic strain from less than 1% to 15%, and its plastic deformation dynamics yields a power-law distribution of shear avalanches. Based upon the analysis of the experimental results, it is indicated that this can be connected to the SMAT-induced microstructural modifications and the resulting residual compressive stress in the Zr-based BMG.
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